it wouldnt be in the UFC, thats for sure.
Bob Arum would never allow it. Manny is so big he could promote his own MMA show, just for that fight. In typical boxing fashion you could have a stellar undercard of nobodies and a main card full of somewhat more signifigant nobodies.
Still, ppl line up to see Manny throw down. It could be vs a can and ppl would pay.
Thats what i would expect, them to line him up with an inexperienced striker or something.
He does have the right kind of style for MMA, blinding speed, aggressive and can pop in and out faster than Frankie Edgar on speed. He used to train Muay Thai before boxing so im sure he could learn some kicks quickly.
Ground game?? well, dont fight any ground game guys. He would be hard to catch in a cage but still, you cant become a competent grapper in a year, nevermind a good one.